Hi,
We are switching to a makefile to build our Xilinx FPGA bit files. Can
we expect to get an identical bit file (except for date/time in the
bitfile header) if we build through the ISE gui vs building via the
command line?

What we have found is that the output ngd file from the ngdbuild
process (Translate) is not the same in both cases. The file size
differs by 100 bytes, and the resulting bitfiles end up being very
different. Can we expect the ngd file to be identical?

We use synplicity to synthesize the design, which creates an edif
netlist. The edif netlist going into the ISE flow and makefile flow
are identical.

Cheers
Andrew